Little is known about the world’s first serial killer, which is perhaps why accounts of Locusta’s death are . . . eccentric?

Here’s what we do know: Locusta hailed from Gaul, the outer province of Ancient Rome now known as France. Trained in herbs, she mastered the system of “patronage” and made a name for herself as a reliable assassin – or as Dr. Katherine Ramsland calls Locusta’s business, “necro-entrepreneur.” [1] To Locusta’s benefit, Rome brimmed with wealthy, would-be-patrons, eager to hasten the death of rich relatives. These clients also reliably bailed Locusta out of prison when events didn’t unfold per plan.

In AD 54, Empress Agrippina, the fourth wife—and niece—of Emperor Claudius, grew tired of her uncle/husband. She conspired with Locusta to murder Claudius in order to place her son from a previous marriage, Nero, on the throne. The Emperor, however, proved a challenging mark. Not only was he armed with taste testers, he also had a ghastly habit of vomiting each meal by tickling his throat with a feather in order to indulge again—a quirk which limited the time any poison could act.

But Claudius’ habit was not a challenge for Locusta’s ingenuity. Undercover, Locusta managed to avert the taste tester and serve the Emperor death cap mushrooms, likely flavored with aconite.[2] When symptoms of poisoning appeared, Agrippina gave Claudius a feather to purge the poison, but Locusta had laced that as well.

Suffering, the Emperor called for his personal physician, Xenophon, whom the devious women also had in their pocket. So when Xenophon gave Claudius a healing enema, he added poison to the mix as well. Claudius suffered a heinous death and eventually perished on October 13.

While Locusta was subsequently imprisoned in AD 55, Nero sought to secure his throne by contracting Locusta to craft a poison to murder Claudius’ son, Britannicus. When the concoction failed initial tests, Nero flogged Locusta with his own hands.[5] Motivated, her second attempt succeeded and the pair was ready for Britannicus.

During Roman times, it was customary to dilute wine with hot water. Britannicus was served wine that was too hot and when he called for cold water, Locusta’s poison was secretly waiting in the pitcher.

Upon Britannicus’s death, Nero bestowed Locusta with pardons, lands, lavish gifts, and condemned prisoners for experimentation. He also sent pupils to study with the poison master.

But all good things come to an end. In AD 68, the Roman Senate tired of Nero’s rogue practices and the Emperor took his own life with a dagger before facing punishment. The Senate’s attention then turned towards Locusta, and without protection from the Emperor, she was convicted with an execution sentence.

Some accounts say Locusta was smeared with vaginal juices of a female giraffe, raped by a specially trained male giraffe, and then torn apart by wild animals. [1] While that tale tantalizes the imagination, it is more likely she was led through the city in chains and executed by human hands.

I first came across Locusta’s story last fall, struck by the statement the world’s first serial killer was a woman. Even as a modern, non-traditional gal, it contradicted my expectation. My mind pondered what had motivated a female from Gaul to pursue such violence. What possessed Locusta to reach so far beyond expectation, to fulfill her sadistic cravings with poison? Where would she have learned her craft? How would she have honed the alchemy? The musings manifested in my historical fiction thriller, Apricots and Wolfsbane.

K.M. Pohlkamp is a blessed wife, proud mother of two young children, and an aerospace engineer who works in Mission Control. She operated guidance, navigation and control systems on the Space Shuttle and is currently involved in development of upcoming manned-space vehicles. A Cheesehead by birth, she now resides in Texas for her day job and writes to maintain her sanity. Her other hobbies include ballet and piano. K.M. has come a long way from the wallpaper and cardboard books she created as a child. Her debut historical fiction novel, Apricots and Wolfsbane, was published by Filles Vertes Publishing in October. You can find K.M. at www.kmpohlkamp.com or @KMPohlkamp